No... You can only change it to other characters in game for Multiplayer use only or if you hack.
i have Pokemon diamond, and played 600 hours. its not possible. but you can catch a ditto, and make Pokemon eggs.
This is not possible, sorry.
no it is not possible to have a dialga doll even if you have an action replay
There are no cheats in Pokemon diamond, although you can buy action replay and get all of the cheats possible like: Every Pokemon,999 Master Balls ETC
http://www.freewebs.com/actionreplaydipe/diamondcodes.htm
Only through a Pokemon event is it possible.
No you can not change into a Pokemon . Only in other games .
where is heaven's pipe in Pokemon diamond i have the action replay
No. Oshawatt is not present in Pokemon Diamond.
You Can ONLY Get Celebi In Pokemon Diamond By Using Action Replay.
buy a action replay or cheat cartridge with Pokemon diamond on it
It isn't possible to catch mew in Pokemon diamond. You need an action replay cheat cartridge.